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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687030b87636c82909a74a5a55663a85947c56579874c6c0d2d0b1ee4043070c' 
  AND token = 'Gr771ozGsZBuscjTX2eRH/ioshjPoY+AlSI4L4XR87w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}